Ezekiel 20:12, 20, 21

Also I gave them my Sabbaths as a sign between us, so they would know that I the LORD made them holy.

Keep my Sabbaths holy, that they may be a sign between us. Then you will know that I am the LORD your God.”

“ ‘But the children rebelled against me: They did not follow my decrees, they were not careful to keep my laws, of which I said, “The person who obeys them will live by them,” and they desecrated my Sabbaths. So I said I would pour out my wrath on them and spend my anger against them in the wilderness.